Title: TmwFastTime - High Resolution Counter (Delphi Component)
Question:
Answer:
It queries a High Resolution Counter with a precision of about 0,00083 ms.
For extremely short times the result may be false (Windows API
function: QueryPerformanceCounter)
{--------------------------------------------------------------------}
{ TmwFastTime V 1.0 }
{ Written by Martin Waldenburg 1996. }
{ Copyright by Martin Waldenburg 1996. All rights reserved. }
{ This is FreeWare. }
{ It's provided as is, without a warranty of any kind. }
{ You use it at your own risc. }
{ You may use and distribute it freely. }
{ But You may not say it's your work }
{ If you distribute it you must provide all Files. }
{--------------------------------------------------------------------}
{ It queries a High Resolution Counter with a precision of about }
{ 0,00083 ms. For extremely short times the result may be false }
{--------------------------------------------------------------------}
unit mwFastTime;
interface
uses
Windows, SysUtils, Classes;
type
TmwFastTime = class(TComponent)
private
c, n1, n2: {$IFDEF Ver120} Int64 {$ELSE}
TLargeInteger {$ENDIF} ;
FElapsedTime : ShortString;
protected
public
constructor Create(AOwner:TComponent);override;
destructor Destroy;override;
Property ElapsedTime : ShortString read FElapsedTime;
Procedure Start;
Procedure Stop;
published
Property Name;
Property Tag;
end;
procedure Register;
implementation
{~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~}
procedure Register;
begin
RegisterComponents('mw',[TmwFastTime]);
end;
{~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~}
constructor TmwFastTime.Create(AOwner:TComponent);
begin
inherited Create(AOwner);
FElapsedTime := '';
end;
{~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~}
destructor TmwFastTime.Destroy;
begin
inherited Destroy;
end;
{~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~}
Procedure TmwFastTime.Start;
begin
QueryPerformanceFrequency(c);
QueryPerformanceCounter(n1);
end;
{~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~}
Procedure TmwFastTime.Stop;
begin
QueryPerformanceCounter(n2);
{$ifdef ver120}
FElapsedTime:= format('Seconds: %g', [(n2 - n1)
/ c ]);
{$else}
FElapsedTime:= format('Seconds: %g', [(n2.QuadPart - n1.QuadPart)
/ c.QuadPart]);
{$endif}
end;
end.
{------------------------------------------------------------}
{ Martin Waldenburg }
{ Landaeckerstrasse 27 }
{ 71642 Ludwigsburg }
{ Germany }
{ }
{ Sugestions, improvements and code of any kind are welcome }
{ Thanks for trying my code. }
{ Share your code! }
{------------------------------------------------------------}